Though this isn’t really the place for it, I think the Gospel of Matthew would have something to say about that. He made promises, concrete promises to Peter, to His Apostles, and to the Church built upon them. To assume that YOU must be right, in the face of 2000 years of constant teaching, sounds a bit more like the arrogant belief in infallibility that you accuse the church of than what the Church actually believes. Jesus made no guarantees that you, noma, 2000 years after His birth, would have the complete guidance of the Holy Spirit, that the Gates of Hell would not stand against you. He did to His Church.